#container{
	width: 1000px;
	margin: 0 auto;
	border: 1px dashed orangered;
	display: grid;
	grid-template-columns: repeat(3,1fr);
	grid-template-rows: 400px 300px 200px 80px;
	grid-gap: 10px 5px;
}
#container>div{
	background-color: aqua;
	border: 1px solid olive;
}
.firstGrid{
	grid-column: 1/span 3;
}
.secondGrid{
	grid-row: 2/4;
}